/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.channel;

import org.jpos.core.Configuration;
import org.jpos.core.ConfigurationException;
import org.jpos.iso.*;
import org.jpos.util.LogEvent;
import org.jpos.util.Logger;

import java.io.BufferedReader;
import java.io.EOFException;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.ServerSocket;

/**
 * Implements an ISOChannel suitable to be used to connect to an X.25 PAD.
 *
 * @author <a href="mailto:apr@cs.com.uy">Alejandro P. Revilla</a>
 * @version $Id$
 * @see ISOMsg
 * @see ISOException
 * @see ISOChannel
 */
public class PADChannel extends BaseChannel {
	BufferedReader reader = null;
	long delay = 0L;

	/**
	 * No-args constructor
	 */
	public PADChannel() {
		super();
	}

	/**
	 * Constructs client ISOChannel
	 *
	 * @param host server TCP Address
	 * @param port server port number
	 * @param p    an ISOPackager
	 * @see ISOPackager
	 */
	public PADChannel(String host, int port, ISOPackager p) {
		super(host, port, p);
	}

	/**
	 * Construct server ISOChannel
	 *
	 * @param p an ISOPackager
	 * @throws IOException
	 * @see ISOPackager
	 */
	public PADChannel(ISOPackager p) throws IOException {
		super(p);
	}

	/**
	 * constructs a server ISOChannel associated with a Server Socket
	 *
	 * @param p            an ISOPackager
	 * @param serverSocket where to accept a connection
	 * @throws IOException
	 * @see ISOPackager
	 */
	public PADChannel(ISOPackager p, ServerSocket serverSocket)
			throws IOException {
		super(p, serverSocket);
		if (delay > 0L)
			ISOUtil.sleep(delay);
	}

	@Override
	public ISOMsg receive() throws IOException, ISOException {
		byte[] header = null;
		ISOMsg m = new ISOMsg();
		m.setPackager(packager);
		m.setSource(this);
		int hLen = getHeaderLength();
		LogEvent evt = new LogEvent(this, "receive");
		try {
			synchronized (serverInLock) {
				if (hLen > 0) {
					header = new byte[hLen];
					serverIn.readFully(header);
				}
				m.unpack(serverIn);
			}
			m.setHeader(header);
			m.setDirection(ISOMsg.INCOMING);
			m = applyIncomingFilters(m, evt);
			m.setDirection(ISOMsg.INCOMING);
			evt.addMessage(m);
			cnt[RX]++;
			setChanged();
			notifyObservers(m);
		} catch (ISOException e) {
			evt.addMessage(e);
			throw e;
		} catch (EOFException e) {
			evt.addMessage("<peer-disconnect/>");
			throw e;
		} catch (InterruptedIOException e) {
			evt.addMessage("<io-timeout/>");
			throw e;
		} catch (IOException e) {
			if (usable)
				evt.addMessage(e);
			throw e;
		} catch (Exception e) {
			evt.addMessage(e);
			throw new ISOException("unexpected exception", e);
		} finally {
			Logger.log(evt);
		}
		Logger.log(evt);
		return m;
	}

	@Override
	public void send(ISOMsg m) throws IOException, ISOException {
		super.send(m);
	}

	@Override
	public void setConfiguration(Configuration cfg)
			throws ConfigurationException {
		super.setConfiguration(cfg);
		delay = cfg.getLong("delay", 0L);
	}

	/**
	 * @param header Hex representation of header
	 */
	public void setHeader(String header) {
		super.setHeader(
				ISOUtil.hex2byte(header.getBytes(), 0, header.length() / 2)
		);
	}
}
